In this paper, methods for selectivity improvement of semiconductor gas sensors are presented. The frequently used techniques are: temperature modulation, synthesis of new materials, designing new sensor constructions, adopting filter layers and using of sensors array. A comparison between the different methods has been made. It was concluded that the kind of sensing material and filter layer have a strong influence on the sensor parameters. The analysis has shown that the optimal detection temperature change when using multilayer gas sensors.
In the paper the low temperature deposition of zinc oxide called Chemical Bath Deposition (CBD) will be described. Zinc oxide nanocrystals grow on the thin layer of ZnO. In our investigation the thin film of ZnO was deposited using spin coating, on the glass substrate covered with thin film of Indium Tin Oxide (ITO). The goal of our research is to develop a cheap method of ZnO nanostructures growth, which will be applied in electrochemical gas sensors as a gas sensitive layer.
In this paper we presented influence of acidity on nanopowder structure prepared in reaction of precipitation. Zinc oxide was prepared from zinc nitrate and sodium hydroxide with the participation of the microwave field. The investigation revealed that the grain size of zinc oxide and their microstructure significantly depends on the solution pH. The microstructures obtained in the more alkaline reaction conditions have greater the aspect ratio.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.